package main

import (
	"code.google.com/p/weed-fs/go/glog"
	"code.google.com/p/weed-fs/go/util"
	"code.google.com/p/weed-fs/go/weed/weed_server"
	"github.com/gorilla/mux"
	"net/http"
	"os"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"time"
)

var (
	filer FilerOptions
)

func init() {
	cmdServer.Run = runServer // break init cycle
}

var cmdServer = &Command{
	UsageLine: "server -port=8080 -dir=/tmp -max=5 -ip=server_name",
	Short:     "start a server, including volume server, and automatically elect a master server",
	Long: `start both a volume server to provide storage spaces 
  and a master server to provide volume=>location mapping service and sequence number of file ids
  
  This is provided as a convenient way to start both volume server and master server.
  The servers are the same as starting them separately.
  So other volume servers can use this embedded master server also.
  
  `,
}

var (
	serverIp                      = cmdServer.Flag.String("ip", "localhost", "ip or server name")
	serverMaxCpu                  = cmdServer.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
	serverTimeout                 = cmdServer.Flag.Int("idleTimeout", 10, "connection idle seconds")
	serverDataCenter              = cmdServer.Flag.String("dataCenter", "", "current volume server's data center name")
	serverRack                    = cmdServer.Flag.String("rack", "", "current volume server's rack name")
	serverWhiteListOption         = cmdServer.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
	serverPeers                   = cmdServer.Flag.String("peers", "", "other master nodes in comma separated ip:masterPort list")
	masterPort                    = cmdServer.Flag.Int("masterPort", 9333, "master server http listen port")
	masterMetaFolder              = cmdServer.Flag.String("mdir", "", "data directory to store meta data, default to same as -dir specified")
	masterVolumeSizeLimitMB       = cmdServer.Flag.Uint("volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
	masterConfFile                = cmdServer.Flag.String("conf", "/etc/weedfs/weedfs.conf", "xml configuration file")
	masterDefaultReplicaPlacement = cmdServer.Flag.String("defaultReplicaPlacement", "000", "Default replication type if not specified.")
	volumePort                    = cmdServer.Flag.Int("port", 8080, "volume server http listen port")
	volumePublicUrl               = cmdServer.Flag.String("publicUrl", "", "Publicly accessible <ip|server_name>:<port>")
	volumeDataFolders             = cmdServer.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
	volumeMaxDataVolumeCounts     = cmdServer.Flag.String("max", "7", "maximum numbers of volumes, count[,count]...")
	volumePulse                   = cmdServer.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
	isStartingFiler               = cmdServer.Flag.Bool("filer", false, "whether to start filer")

	serverWhiteList []string
)

func init() {
	filer.master = cmdServer.Flag.String("filer.master", "", "default to current master server")
	filer.collection = cmdServer.Flag.String("filer.collection", "", "all data will be stored in this collection")
	filer.port = cmdServer.Flag.Int("filer.port", 8888, "filer server http listen port")
	filer.dir = cmdServer.Flag.String("filer.dir", "", "directory to store meta data, default to a 'filer' sub directory of what -mdir is specified")
	filer.defaultReplicaPlacement = cmdServer.Flag.String("filer.defaultReplicaPlacement", "", "Default replication type if not specified during runtime.")
}

func runServer(cmd *Command, args []string) bool {

	*filer.master = *serverIp + ":" + strconv.Itoa(*masterPort)

	if *filer.defaultReplicaPlacement == "" {
		*filer.defaultReplicaPlacement = *masterDefaultReplicaPlacement
	}

	if *serverMaxCpu < 1 {
		*serverMaxCpu = runtime.NumCPU()
	}
	runtime.GOMAXPROCS(*serverMaxCpu)

	folders := strings.Split(*volumeDataFolders, ",")
	maxCountStrings := strings.Split(*volumeMaxDataVolumeCounts, ",")
	maxCounts := make([]int, 0)
	for _, maxString := range maxCountStrings {
		if max, e := strconv.Atoi(maxString); e == nil {
			maxCounts = append(maxCounts, max)
		} else {
			glog.Fatalf("The max specified in -max not a valid number %s", max)
		}
	}
	if len(folders) != len(maxCounts) {
		glog.Fatalf("%d directories by -dir, but only %d max is set by -max", len(folders), len(maxCounts))
	}
	for _, folder := range folders {
		if err := util.TestFolderWritable(folder); err != nil {
			glog.Fatalf("Check Data Folder(-dir) Writable %s : %s", folder, err)
		}
	}

	if *masterMetaFolder == "" {
		*masterMetaFolder = folders[0]
	}
	if *filer.dir == "" {
		*filer.dir = *masterMetaFolder + "/filer"
		os.MkdirAll(*filer.dir, 0700)
	}
	if err := util.TestFolderWritable(*masterMetaFolder); err != nil {
		glog.Fatalf("Check Meta Folder (-mdir=\"%s\") Writable: %s", *masterMetaFolder, err)
	}
	if err := util.TestFolderWritable(*filer.dir); err != nil {
		glog.Fatalf("Check Mapping Meta Folder (-filer.dir=\"%s\") Writable: %s", *filer.dir, err)
	}

	if *volumePublicUrl == "" {
		*volumePublicUrl = *serverIp + ":" + strconv.Itoa(*volumePort)
	}
	if *serverWhiteListOption != "" {
		serverWhiteList = strings.Split(*serverWhiteListOption, ",")
	}

	if *isStartingFiler {
		go func() {
			r := http.NewServeMux()
			_, nfs_err := weed_server.NewFilerServer(r, *filer.port, *filer.master, *filer.dir, *filer.collection)
			if nfs_err != nil {
				glog.Fatalf(nfs_err.Error())
			}
			glog.V(0).Infoln("Start Weed Filer", util.VERSION, "at port", strconv.Itoa(*filer.port))
			filerListener, e := util.NewListener(
				":"+strconv.Itoa(*filer.port),
				time.Duration(10)*time.Second,
			)
			if e != nil {
				glog.Fatalf(e.Error())
			}
			if e := http.Serve(filerListener, r); e != nil {
				glog.Fatalf("Filer Fail to serve:%s", e.Error())
			}
		}()
	}

	var raftWaitForMaster sync.WaitGroup
	var volumeWait sync.WaitGroup

	raftWaitForMaster.Add(1)
	volumeWait.Add(1)

	go func() {
		r := mux.NewRouter()
		ms := weed_server.NewMasterServer(r, *masterPort, *masterMetaFolder,
			*masterVolumeSizeLimitMB, *volumePulse, *masterConfFile, *masterDefaultReplicaPlacement, *garbageThreshold, serverWhiteList,
		)

		glog.V(0).Infoln("Start Weed Master", util.VERSION, "at port", *serverIp+":"+strconv.Itoa(*masterPort))
		masterListener, e := util.NewListener(
			*serverIp+":"+strconv.Itoa(*masterPort),
			time.Duration(*serverTimeout)*time.Second,
		)
		if e != nil {
			glog.Fatalf(e.Error())
		}

		go func() {
			raftWaitForMaster.Wait()
			time.Sleep(100 * time.Millisecond)
			var peers []string
			if *serverPeers != "" {
				peers = strings.Split(*serverPeers, ",")
			}
			raftServer := weed_server.NewRaftServer(r, peers, *serverIp+":"+strconv.Itoa(*masterPort), *masterMetaFolder, ms.Topo, *volumePulse)
			ms.SetRaftServer(raftServer)
			volumeWait.Done()
		}()

		raftWaitForMaster.Done()
		if e := http.Serve(masterListener, r); e != nil {
			glog.Fatalf("Master Fail to serve:%s", e.Error())
		}
	}()

	volumeWait.Wait()
	time.Sleep(100 * time.Millisecond)
	r := http.NewServeMux()
	weed_server.NewVolumeServer(r, *serverIp, *volumePort, *volumePublicUrl, folders, maxCounts,
		*serverIp+":"+strconv.Itoa(*masterPort), *volumePulse, *serverDataCenter, *serverRack, serverWhiteList,
	)

	glog.V(0).Infoln("Start Weed volume server", util.VERSION, "at http://"+*serverIp+":"+strconv.Itoa(*volumePort))
	volumeListener, e := util.NewListener(
		*serverIp+":"+strconv.Itoa(*volumePort),
		time.Duration(*serverTimeout)*time.Second,
	)
	if e != nil {
		glog.Fatalf(e.Error())
	}
	if e := http.Serve(volumeListener, r); e != nil {
		glog.Fatalf("Fail to serve:%s", e.Error())
	}

	return true
}
